IWMSActiveMedia Interface
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IWMSActiveMedia Interface
The IWMSActiveMedia interface provides information about the currently active media element in a playlist. A media element can include both audio and video streams.
In addition to the methods inherited from IDispatch, the IWMSActiveMedia interface exposes the following methods.
Method | Description |
get_Duration | Retrieves the total length of the media element, in milliseconds. |
get_Live | Retrieves a Boolean value that indicates whether the media element originates from a live source. |
get_Streams | Retrieves an IWMSActiveStreams interface that contains a collection of the media streams that make up the active media element. |
get_TotalPackets | Retrieves the total number of data packets contained in the active media element. |
GetProperty | Retrieves a specific property from the active media element. |
Example Code
The following example illustrates how to retrieve a pointer to an IWMSActiveMedia interface.
#include <windows.h> #include <atlbase.h> // Includes CComVariant. #include "wmsserver.h" // Declare variables and interfaces. HRESULT hr; IWMSServer *pServer; IWMSPlayers *pPlayers; IWMSPlayer *pPlayer; IWMSPlaylist *pPlaylist; IWMSActiveMedia *pActiveMedia; CComVariant varIndex; long lCount; // Initialize the COM library and retrieve a pointer // to the IWMSServer interface. hr = CoInitialize(NULL); hr = CoCreateInstance(CLSID_WMSServer, NULL, CLSCTX_ALL, IID_IWMSServer, (void **)&pServer); if (FAILED(hr)) goto EXIT; // Retrieve a pointer to the IWMSPlayers interface // and retrieve the number of connected players. hr = pServer->get_Players(&pPlayers); if (FAILED(hr)) goto EXIT; hr = pPlayers->get_Count(&lCount); if (FAILED(hr)) goto EXIT; // If players are connected, retrieve a pointer to // an IWMSPlayer interface containing the first player. if (lCount > 0) { varIndex = 0; hr = pPlayers->get_Item(varIndex, &pPlayer); if (FAILED(hr)) goto EXIT; } // Retrieve the playlist for the player. // NOTE: A valid playlist file is not always returned. This may be // the case, for example, if the user requested a specific content // file or if a broadcast publishing point is being used. hr = pPlayer->get_RequestedPlaylist(&pPlaylist); if (FAILED(hr)) goto EXIT; if (pPlaylist != NULL) { // Retrieve a pointer to the IWMSActiveMedia interface. hr = pPlaylist->get_CurrentMediaInformation(&pActiveMedia); if (FAILED(hr)) goto EXIT; } EXIT: // TODO: Release temporary COM objects and uninitialize COM.
See Also
- IWMSActiveStream Interface
- IWMSPlayer Interface
- IWMSPlaylist Interface
- Server Object Model Interfaces (C++)
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